Celtic began their defense of the Scottish Gas Scottish Cup with a 2-1 fourth round win over a spirited Kilmarnock at Parkhead.
Killie goalkeeper Robbie McCrory was injured less than a minute into the game and had to be replaced by Kieran O'Hara, who was beaten by Celtic captain Callum McGregor from long range in the 12th minute.
The holders should have extended their lead after that but were stunned in first-half added time when Rugby Park teenage striker Bobby Wales equalized from close range.
Celtic stepped up the pressure after the break and Daizen Maeda struck in the 70th minute, but they could not overcome Derek McInnes' side, who kept the tie alive and edgy until the final whistle.
Aberdeen ended their long winless streak and progressed to the fifth round with a comfortable win over a 10-man League Two side Elgin.
After a shaky start, Shayden Morris calmed any Don nerves with a low finish from Duk's pass and Duk himself found the net twice in the second half to seal victory against a home side that saw Lyall Booth sent off after 75 minutes.
Martin Boyle continued his scoring streak to help Hibernian reach the fifth round of the Scottish Cup with a comfortable 3-0 win Clydebank.
The Australia international – who has scored twice in each of his last three games – broke the deadlock with two minutes to go.
However, West of the Scottish Premier League leaders Clydebank dug in and Hibs had to wait until the start of the second period to add to their lead.
That goal came through Rudi Molotnikov before Boyle added his second.
There was extra cheer for Hibs supporters when Kieron Bowie came off the bench to make his first appearance since suffering a hamstring injury in September.
Andrew Shinnie scored a late winner as Livingston amazed Ross County to knock them out. His 119th-minute winner saw the Championship side cause the first major shock of the fourth round.
It has been six years since County have won a game in the competition, with their most recent success coming in a 2-1 victory over Motherwell in January 2019.
A clinical early double set by Toyosi Olusanya St Mirren en route to a 3-1 away win Queen of the South.
The Englishman netted in the 10th and 21st minutes to take his tally for the season to 10 goals and put the Premiership side in command of the tie at Palmerston Park.
Brennan Dickenson brought the League One hosts back into contention with a 75th-minute strike, but the Saints – after a few nervous moments – sealed their progress to the last 16 with a stoppage-time goal from substitute Caolan Boyd-Munce.
Mackenzie Kirk scored the early goal St Johnstone the fans are in dire need of a cheer and a knockout in the cup Motherwell without the visitors striking a blow.
Kirk scored from the rebound in the ninth minute to give St Johnstone's first goal of the tournament since Shaun Rooney headed the winner in the 2021 final against Hibernian. Since then they have lost to Kelty Hearts, Rangers and Airdrie in the fourth round.
Kirk's goal proved enough to send the Saints through to the fifth round with a 1-0 win and end a nine-game winless run which saw them nine points adrift in the Premiership. A win will give them hope that they can close the gap next week when they host Motherwell again.